I'm able to reproduce the "Along Edges" bug for larger hexes and stroke width, but not the single ore type in starter hex with the "Single Hex" option, even with high bias like 200. For now, the "Along Edges" bug can be resolved by tweaking the resource stroke with settings, to bring the resources back. I tested a nauvis hex size of 48 and stroke width of 12 with a resource stroke width of 5, and that brought resource back with a visible stroke width of 4.
The whole stroke width calculation (going for both the tiles between hexes and the resource spawning along edges) is quite convoluted and hard for me to understand. I've spent a lot of time struggling with it to make it work somewhat as expected. Part of the weirdness in its behavior is from floating point arithmetic and how axial (hexagonal) grids don't align nicely with rectangular grids, but also there definitely seems to be some small error in the math somewhere. Not sure what's up with it.